Am. Hammoudeh et G. Allen, MILLIMETRIC WAVELENGTHS RADIOWAVE PROPAGATION FOR LINE-OF-SIGHT INDOOR MICROCELLULAR MOBILE COMMUNICATIONS, IEEE transactions on vehicular technology, 44(3), 1995, pp. 449-460
With the increasing spectrum occupancy below 1 GHz, which is allocated
to cellular personal and mobile radio, this paper exploits the use of
millimeter waves where large signal bandwidths are available for indo
or microcellular communications. The results of propagation experiment
s conducted at 60.4 GHz (the oxygen absorption band) and 38.25 GHz to
determine multipath characteristics in a number of indoor microcell ch
annels employing omnidirectional antennas are presented, Cumulative di
stribution functions for received signal envelope, as well as correspo
nding power spectra are given, In addition, a comparison between the f
ading statistics measured at 60.4 GHz and 38.25 GHz under similar cond
itions is made, The change in multipath characteristics due to the pre
sence of different building materials is also illustrated, A ray model
is developed to represent indoor microcell propagation by considering
a direct ray plus rays which have undergone single and double reflect
ions from the walls, Specular floor-reflected and ceiling-reflected ra
ys are included when the antennas radiation pattern does not preclude
them, Using this simple model, the signal variations and the amplitude
of reflected rays with respect to the line of sight (LOS) ray as func
tions of mobile receiver position are predicted and used to assist in
interpreting experimental results, Theoretical results are found to be
in good agreement with measured ones, with the model also being used
to predict structure-induced root mean square (rms) delay spread along
receiver routes in an indoor microcell environment, This parameter is
a measure of multipath conditions in a mobile radio channel and is in
versely proportional to the maximum usable data signalling rate of a c
hannel.